Quantum Instruments DLT 7000 - Manual (Page 207)

SCSI Commands
Quantum DLT 7000 Tape System 5-103
MODE SENSE (6) / (10) Command (1Ah / 5Ah) (continued)
Table 5–49 MODE SENSE Control Descriptor Block - Field Descriptions
Field Name Description
DBD Disable Block Descriptors. If 0, device returns the block descriptor
data. If set to 1, block descriptor information is not returned.
PC Page Control. The Page Control field indicates the type of page
parameter values to be returned to the host.
PC Description
00 Report Current Values
01 Report Changeable Values
10 Report Default Values
11 Report Saved Values
Page Code This field allows the host to select any specific page or all of the
pages supported by the drive.
Allocation Length This field specifies the number of bytes that the host has allocated for
returned MODE SENSE data. An allocation length of zero indicates
that the drive will return no MODE SENSE data. This is not considered
an error, and GOOD status is returned.
MODE SENSE may be either MODE SENSE (6) or MODE SENSE (10). MODE
SENSE (6) data contains a 4-byte header followed by one 8-byte block descriptor,
followed by zero or more variable length pages, depending on the Page Code and
Allocation Length.